<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/images/logo.png" alt="" />
      </div>
      <el-form ref="loginFormRef" :model="loginForm" :rules="rulesForm" label-width="0px" class="formBox">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login()">登录</el-button>
          <el-button type="info" @click="loginFormRef()">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //   这时表单的验证规则对象
      rulesForm: {
        //   验证用户名
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 2, max: 5, message: '长度在 2 到 5 个字符', trigger: 'blur' }
        ],
        // 验证密码
        password: [
          { required: true, message: '请输入用户密码', trigger: 'blur' },
          { min: 6, max: 15, message: '请输入6~15位数密码', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    loginFormRef() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return true
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        console.log(res.data)

        // 将登入成功后的token，保存到客户端的sessionStorage中
        // A:项目中除了登入之外的其他API接口，必须登入之后才能访问
        // B:token只有在网站打开期间生效，所以要将token保存到客户端的sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转到后台
        this.$router.push('/home')
      })
    }
  }
}
</script>
<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      box-shadow: 0 0 10px #ddd;
      border-radius: 50%;
      padding: 10px;
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .formBox {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }
    .btns {
      display: flex;
      justify-content: flex-end;
    }
  }
}
</style>
